I am ready to make the move from windows to mac. I don't want to invest in both a desktop and laptop if I can avoid. My needs are rather business basic: composition, spreadsheets, pdfs, internet (nothing exotic or demanding like gaming or video). Does it sound like a MacBook Air with external monitor, keyboard, and mouse be sufficient? I know nothing about Mac and my only exposure is thru the Iphone 6+ which is truly extraordinary. I will appreciate any feedback you can offer. thank you kindly.